Real top speed bummer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hgs_notes · 09-03-2003, 07:29 PM

I was driving the wifes 99 GMC burb today. I like it. It's nice.

I'm heading out of town on one of the many quiet 2 laner county roads, nothing but caorn fields and silos for several miles. I decide after a hard day of not much to see what this baby will do. It only revs about 1700 rpm for like 60 mph, it should fly right?

Well, I'm getting me a jet chip, cause it starts cutting out at like 100 mph and I know there is a lot more there. Anybody out there used a chip and found out the top end on a vortec 5.7?

HG

GreenMystChevy · 09-03-2003, 07:39 PM

It could be the govenor only allowing you to hit a certain top speed.
I know that our Chrysler 300M tops out at 110 MPH, whatever that's about

I was kinda bummed out because it was still pulling strong. If it ain't the govenor maybe just put some high octane gas in there.

GMC69 · 09-03-2003, 07:54 PM

It's probably the governor, my 2003 Malibu pulls strong until it hits about 108 mph, ( 170 km/h) then just dies. You might be able to find a chip that will remove it.

jef5150 · 09-03-2003, 08:03 PM

http://performanceford.com/01cktruck.html ,,,,your top speed is 101mph,,,,,jeff

gmc67swb · 09-03-2003, 08:07 PM

you can get a hypertech plug-in programmer that well eliminate the top speed shut off as well as a few other things to speed it up. the manufacturers of the vehicles don't want you to exceed the tire's rated max speed, so to be safe you have a fuel shut off. my '98 ss wouldn't shut off and it had z rated tires. my parents t/a would shut off at 112. my dad calls the dealer and asks about it and they tell him if he puts on z rated tires they'll remove the limiter.

jef5150 · 09-03-2003, 08:18 PM

http://www.streetbeatcustoms.com/19chevgmcveh.html 1 thing was said at both sites,they said if you replace youre themostat with 160deg,the computor will think your engine is cooler than it is and will supply more fuel than normal,,,,however this will "only" occur at "WIDE OPEN THROTTLE ONLY"...JEFF

hgs_notes · 09-03-2003, 10:05 PM

Thanks everyone.

Has anybody used a chip or reprogrammer and tested their top end yet? At least on a vortec 5.7.

HG

cheatham · 09-03-2003, 10:11 PM

My truck has 2 speed limiters!

1.Speedo pegs at 100

2.It's an aerodynamic brick

Is there a chip that will fix this?

09-03-2003, 07:29 PM	#1
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Real top speed bummer I was driving the wifes 99 GMC burb today. I like it. It's nice. I'm heading out of town on one of the many quiet 2 laner county roads, nothing but caorn fields and silos for several miles. I decide after a hard day of not much to see what this baby will do. It only revs about 1700 rpm for like 60 mph, it should fly right? Well, I'm getting me a jet chip, cause it starts cutting out at like 100 mph and I know there is a lot more there. Anybody out there used a chip and found out the top end on a vortec 5.7? HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-03-2003, 07:39 PM	#2
GreenMystChevy Registered User Join Date: Jan 2002 Location: Woodinville, WA Posts: 513	It could be the govenor only allowing you to hit a certain top speed. I know that our Chrysler 300M tops out at 110 MPH, whatever that's about I was kinda bummed out because it was still pulling strong. If it ain't the govenor maybe just put some high octane gas in there. __________________ Jeremy '71 C-10 '72 GMC K2500 '72 Nova (Dad's) '70 Chevelle SS '55 Sedan Delivery Attempting to build up this here 4x4...make her real tall and purty...well, maybe just tall

09-03-2003, 07:54 PM	#3
GMC69 Registered User Join Date: Jul 2003 Location: Sudbury, Ontario, Canada Posts: 734	It's probably the governor, my 2003 Malibu pulls strong until it hits about 108 mph, ( 170 km/h) then just dies. You might be able to find a chip that will remove it. __________________ Mike Email: Click here to email me -- 2019 Silvedrado 4x4 1970 Chevy 3/4 ton, 396BB, on air bags

09-03-2003, 08:03 PM	#4
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	ya,ya,i know its a f@rd site,,,,,,,,,,,,,,,,,, http://performanceford.com/01cktruck.html ,,,,your top speed is 101mph,,,,,jeff Last edited by jef5150; 09-03-2003 at 08:06 PM.

09-03-2003, 08:07 PM	#5
gmc67swb Registered User Join Date: Feb 2003 Location: Mesquite, Tx Posts: 396	you can get a hypertech plug-in programmer that well eliminate the top speed shut off as well as a few other things to speed it up. the manufacturers of the vehicles don't want you to exceed the tire's rated max speed, so to be safe you have a fuel shut off. my '98 ss wouldn't shut off and it had z rated tires. my parents t/a would shut off at 112. my dad calls the dealer and asks about it and they tell him if he puts on z rated tires they'll remove the limiter. __________________ GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd

09-03-2003, 08:18 PM	#6
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	http://www.streetbeatcustoms.com/19chevgmcveh.html 1 thing was said at both sites,they said if you replace youre themostat with 160deg,the computor will think your engine is cooler than it is and will supply more fuel than normal,,,,however this will "only" occur at "WIDE OPEN THROTTLE ONLY"...JEFF Last edited by jef5150; 09-03-2003 at 08:22 PM.

09-03-2003, 10:05 PM	#7
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Thanks everyone. Has anybody used a chip or reprogrammer and tested their top end yet? At least on a vortec 5.7. HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-03-2003, 10:11 PM	#8
cheatham I need a brake! Join Date: Jul 2002 Location: Nashville, TN Posts: 474	My truck has 2 speed limiters! 1.Speedo pegs at 100 2.It's an aerodynamic brick Is there a chip that will fix this? __________________ JP MEMBER OF THE DISCS UP FRONT CLUB 1971 Chevy C10



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